Hi Michel :-)

Acutally I didn't figure it out by myself :
http://saintaardvarkthecarpeted.com/blog/archive/2005/02/THE_WINE_OF_BOOT.html

However, here's my 2 cents about it :
1/ The fix (removing "screen" line in ofboot.b on yaboot partition) doesn't work with all versions of the yaboot binary. Works with the one from Debian. Doesn't with yaboot-static on GentooPPC64. But you still can fetch the right binary from the .deb archive
2/ Another possible solution can be to hook up a DVI-> VGA adapter, and plug in a resistor between the right pins (don't remember which) so that yaboot thinks a display is plugged in

Hope that helps !!

 - Romain

2009/10/6 Michel Dänzer <michel@daenzer.net>
On Tue, 2009-10-06 at 11:16 +0200, Romain Goyet wrote:
>
>   I have this Quad G5 here, running GentooPPC64. Runs fine. Had a hard
> time getting it to boot without a screen attached, but I eventually
> managed to (yaboot was the culprit).

Out of curiosity, how did you solve this? I still have an unused monitor
connected to mine...

--
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer